Leases - Narrative (Details) ft² in Thousands, $ in Millions	1 Months Ended
	Oct. 31, 2024 USD ($)	Sep. 30, 2024 USD ($) ft² campus numberOfBuilding numberOfExtensionPeriod	Sep. 30, 2021 ft² numberOfExtensionPeriod
Lessee, Lease, Description [Line Items]
Number of campuses | campus		2
MTC South, MTC North and MTC East
Lessee, Lease, Description [Line Items]
Area of office space (in sqft) | ft²		686
Number of extension | numberOfExtensionPeriod		3
Extension term		5 years
Finance lease, number of properties | numberOfBuilding		3
MTC South, MTC North and MTC East | Moderna Technology Center
Lessee, Lease, Description [Line Items]
Total purchase price | $		$ 370
MTC South, MTC North and MTC East | Subsequent event | Moderna Technology Center
Lessee, Lease, Description [Line Items]
Nonrefundable deposit | $	$ 50
Cambridge leases
Lessee, Lease, Description [Line Items]
Area of office space (in sqft) | ft²		667	462
Number of years			2 years
Lease term			15 years
Number of extension | numberOfExtensionPeriod			2
Extension term			7 years